Book  (Oct 2001)  Page(s) 121.  Includes photo(s).
 
Clematis australis
Evergreen Group
Origin: New Zealand
Species 1899
... single, scented, pale yellow to off-white flowers... five narrow, spear-shpaed tepals... Needs sharp drainage and a warm, sheltered, south-facing wall... Not suitable for very cold gardens...

Book  (11 Oct 2000)  Page(s) 82.